Composition of copper alloys containing strontium.



COMPOSITION OF COPPER,

No Ilrawing.

To all whom it may concern:

Be it known that we, FRANCIS C. FRARY and STERLING N. TEMPLE, citizens of the United States, and residents, respectively, of Niagara Falls, in the county of Niagara and State of New York, and St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in the Composition of Copper Alloys Containing Strontium, of which the following is a specification.

Our invention has for its object to provide an alloy of copper having certain desir-' able properties, particularly hardness and freedom from blow-holes in castings.

In carrying out our invention, as generally disclosed in our U. S. Patent No. 1,169,392, of Jan. 25, 1916, we alloy with the copper a small amount of metallic strontium, whereby the copper is hardened and all dissolved gases are removed, causing the metal to make castings free from blow-holes. If the amount of strontium is small, the electrical conductivity of the copper is not materially changed. It is to be noted'that this hardness is produced in the metal when cast and cooled in the ordinary way, without mechanical treatment such as hard-drawing, etc., but such mechanical treatment could also be applied to the alloyif desired.

' In carrying out our invention, we may prepare a strontium-copper alloy by electrolysis of fused strontium chlorid, or a mixture of this salt with other salts, using a molten copper cathode. By this means we Specification of Letters Iatent.

=4. FALLS, NEW YORK, AND STERLING N. TEMPLE, OF

ST. PAUL, MINNESOTA.

ALLOYS CONTAINING STRONTI.

Patented air. 12, 1918.

Application filed March e1, 1916. Serial No. 87,990. 1

have prepared such an alloy, and find it to have the properties stated, even when the amount of strontium is less than one per cent. It is obvious that we may also prepare the alloy by melting copper, and thereafter adding metallic strontium, or an alloy containing strontium, to the copper.

In the practical operation of our invention, we prefer to use with the strontium some other metal or metals of the alkaline earths, as described in our U. S. Patent aforementioned, because we find that, in general, the presence of more than one of these elements increases the hardening effect of each, and because others, notably calcium, are cheaper to prepare.

What we claim is:

- As a new composition of matter, a metallic alloyharder than pure copper, containing a main body of copper, and in addition thereto containing a small amount of strontium.

, Signed at Niagara Falls, New York, this 28 day of March, 1916.

FRANCIS C. FRARY.

- In presence of J. F. REIDY, ARNOLD MOHN. 

